RunThrough Presents….
Dorney lake duathlon
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Join Us for the Royal Windsor Triathlon
on Sunday 14th June 2026
and celebrate our 35 Year Anniversary!
Start your summer strong at one of the UK’s most iconic multisport events, the Royal Windsor Triathlon returns on Sunday 14th June 2026! With Sprint, Standard, and Relay options available, this award-winning race is perfect for triathletes of all abilities.
The day begins with an open water swim in the River Thames – keep an eye out for swans! Next, take on a thrilling road cycle through the historic town of Windsor, passing Windsor Castle and heading into the scenic countryside. You’ll finish with a memorable run into Windsor Great Park, along the iconic Long Walk, with the castle framing your final strides.
Whether you’re going solo or teaming up for the relay, the Royal Windsor Triathlon is a must-do event with a royal backdrop and a buzzing race village atmosphere.
The Royal Windsor Triathlon is operated by RunThrough as the Official Event Delivery Partner.
THE LONDON AQUATHLON
Join us for the RunThrough London Aquathlon 25th October 2025
Come and run a chip timed aquathlon, the event consists of a 400m swim inside London Aquatics Centre followed by 5k run around Queen Elizabeth Olympic Park.
This course is not only flat and fast, but also inspiring. The RunThrough London Aquathlon is a great opportunity for a quick time and a fun morning out with a unique themed medal waiting for you at the finish!
THE THORPE PARK SPRINT TRIATHLON
Join us for our Sprint triathlon around Thorpe Park Theme Park and take the opportunity to race around this unique and inspiring venue with FREE Entry into Thorpe Park Theme Park! 2026 DATE COMING SOON!
Thorpe Park Sprint Triathlon offers a unique opportunity within the thrilling amusement park. The lake is London’s ultimate watersport’s resort and the flat grounds lend themselves to a totally flat, fast bike and run course. This is the perfect venue for a chip timed personal best.
THE GUILDFORD TRIATHLON
Take on a Sprint triathlon or Aquathon around Guildford and grab the opportunity to race around this unique venue!
This Sprint Triathlon is an exceptional choice for those chasing personal bests, first-time triathletes or those who prefer indoor pool facilities, at the prestigious Surrey Sports Park.
Following the pool swim, the bike course takes you out on the open roads towards Worplesdon, Pirbright and Normandy before returning to the Park and finishing off with a 5km scenic forest run.
The Kids Tristar Aquathlons are the perfect introductory event for children aged 8 to 14 looking to try multipart.
2026 DATE COMING SOON!
THE DORNEY LAKE (TRIATHLON & DUATHLON)
We are excited to announce the return of Dorney Triathlon & Duathlon hosted by RunThrough and Active Training World held at Dorney Lake.
Join us at Dorney Lake; home to London 2012’s rowing and canoeing events for a sprint distance triathlon. The purpose built lake is perfect for the swim and the flat grounds lend themselves to a totally flat bike and run course, ideal for chasing down a new personal best!
Dorney Lake in Windsor is a 2,200 metre flat water rowing lake owned by the well-renowned Eton College. Used for many international regattas, and famously hosted the Rowing events during the London 2012 Olympics.
BOWOOD HOUSE TRIATHLON
The Bowood House Triathlon returns in 2026 and registration is now OPEN! Join us on Saturday 20th June for an unforgettable day of multisport racing set against the stunning backdrop of Bowood House & Gardens. Offering Sprint, Super Sprint, and dedicated Tri Star Youth and Junior race, there’s something exciting for triathletes of all ages and abilities.
Enjoy scenic tarmac bike routes and picturesque multi-terrain runs, all surrounded by the estate’s beautiful gardens and landscapes. Whether you’re a seasoned competitor, a beginner looking for a welcoming first race, or a young athlete ready to compete, the Bowood Triathlon promises an inspiring and supportive race-day atmosphere.
SPRINT TRIATHLON
METRE swim
KILOMETRE RIDE
KILOMETRE RUN
Standard Distance TRIATHLON
METRE swim
KILOMETRE RIDE
KILOMETRE RUN
Licensed by
OUR EVENT PARTNERS
